Gwyneth
There were two threads recently one about wasps and the other spiders. It seemed that many posters just wanted to kill them. If this is the same scenario with all insects I guess the idea of humans physically pollinating crops etc is not so far fetched. We will also see many species of wild flowers etc just die out.
I try not to kill spiders (or bees or other pollinators which I rescue) and we certainly have plenty of spiders here!
However, wasps do die off in the winter with the exception of the queen which hibernates and forms a new colony next year.
So if a wasp lands on my dinner in September I might well dispose of it.